knitr in a knutshell a minimal tutorial

KnitR is a really important tool for
reproducible research. You create documents that are a mixture of
text and code; when processed through KnitR, the code is replaced by
the results and/or figures produced.

Yihui Xie, the developer of KnitR, has written
clear and thorough documentation, many
useful
examples and
demos, and a very nice
book.
Nevertheless, I thought it might be useful to have some of the basic things
explained again a bit differently.

And so, here is a brief guide to KnitR, covering the fundamentals of
its use with
Markdown,
AsciiDoc, and
LaTeX.